The Boston Athletic Association says people who passed the halfway checkpoint but not the finish line will get a code they can use to sign up in August. Regular registration for the 2014 Boston Marathon is scheduled to start in September.

The invitation applies to more than 5,000 people who were stopped on the course when the race was shut down at 2:50 p.m., including 139 runners from New Hampshire.

No decision has been made on whether the field will expand to include an expected influx of runners who say they want to run next year to support the race and the city.

Photos: Honoring Boston Marathon bombing victims, survivors

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Three people were killed and more than 250 injured in the two bombings that rocked the Boston Marathon. Just days later, an MIT police officer was killed.